Interstate 11

Interstate 11 (I-11) is an Interstate Highway that currently runs for 54.193 miles (87.215 km) on a predominantly northwest–southeast alignment in the U.S. state of Nevada, running concurrently with either or both U.S. Route 93 (US 93) and US 95 from the Arizona state line at Mike O'Callaghan–Pat Tillman Memorial Bridge over the Colorado River within Lake Mead NRA outside of the city limits of Boulder City to Las Vegas.

The freeway is tentatively planned to run from Nogales, Arizona, to Fernley, Nevada, generally following the current routes of I-19, I-10, US 93, and US 95. Planners anticipate upgrading four existing highway segments to carry future I-11: US 93 in Arizona from Kingman to the Nevada state line, and from Kingman to Wickenburg, US 95 in Nevada from the Las Vegas Valley to Schurz, and either US 95 (via Fallon) or US 95 Alt (via Yerington) to Fernley. The most recent extension came in 2024, when officials replaced I-515 signs in Las Vegas with I-11 signs and added I-11 signs on US 95 north of Downtown Las Vegas, which extended I-11 northward about 30.5 miles (49.1 km). An extension of the Interstate northward along US 95 to Mercury, Nevada, is planned after that. An exact alignment for I-11 south of Wickenburg has yet to be determined; a number of corridor alternatives, however, have been identified for further study and refinement.

The building of I-11 in Arizona as a freeway bypass from I-19 in Sahuarita to US 93 in Wickenburg is controversial as it is currently facing fierce local opposition and backlash from conservation groups and others citing costs, environmental, traffic, economic and safety concerns as the project is currently on hold pending litigation as of 2025.

The numbering of this highway did not initially fit within the usual conventions of the existing Interstate Highway grid as the whole route was east of I-15. I-17 was already built to the east of the I-11 alignment in Arizona, making it impossible to fit this freeway's Interstate number into the national grid and remain within the traditional numbering convention. I-11 being extended along US 95 through Las Vegas and crossing over I-15 remedied this situation since it put a portion of I-11 west of I-15 and thus in line with the national grid numbering conventions.